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dmatest: Fix NULL pointer dereference on ioat

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device_control is an optional and not implemented in all DMA drivers.
Any calls to these will result in a NULL pointer dereference.  dmatest
makes two of these calls when completing the kernel thread and removing
the module.  These are corrected by calling the dmaengine_device_control
wrapper and checking for a non-existant device_control function pointer
there.

Signed-off-by: Jon Mason <jon.mason@intel.com>
CC: Vinod Koul <vinod.koul@intel.com>
CC: Dan Williams <djbw@fb.com>
Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@linux.intel.com>
This commit is contained in:
Jon Mason 2012-11-11 23:03:20 +00:00 • committed by Vinod Koul
parent e4d43c1764
commit 944ea4dd38
2 changed files with 6 additions and 3 deletions
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5
include/linux/dmaengine.h
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@ -608,7 +608,10 @@ static inline int dmaengine_device_control(struct dma_chan *chan,
enum dma_ctrl_cmd cmd,
unsigned long arg)
{
return chan->device->device_control(chan, cmd, arg);
if (chan->device->device_control)
return chan->device->device_control(chan, cmd, arg);
else
return -ENOSYS;
}
static inline int dmaengine_slave_config(struct dma_chan *chan,